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Test: Life Process and Nutrition - UPSC MCQ


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25 Questions MCQ Test Science & Technology for UPSC CSE - Test: Life Process and Nutrition

Test: Life Process and Nutrition for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Life Process and Nutrition questions and answers have been prepared according to the UPSC exam syllabus.The Test: Life Process and Nutrition MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Life Process and Nutrition below.
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Test: Life Process and Nutrition - Question 1

Leaf is made up of :

Detailed Solution for Test: Life Process and Nutrition - Question 1

Mesophyll cells are a type of ground tissue found in the plant's leaves. Mesophyll cells are specialized for photosynthesis. These cells in the middle of the leaf contain many chloroplasts, the organelles that perform photosynthesis .

Test: Life Process and Nutrition - Question 2

Each stoma is guard by :

Detailed Solution for Test: Life Process and Nutrition - Question 2

The correct answer is Each stoma is guarded by guard cell

Test: Life Process and Nutrition - Question 3

Mesophyll consists of :

Detailed Solution for Test: Life Process and Nutrition - Question 3

The tissues of a leaf that are located in between the layers of epidermis and carry on photosynthesis, consisting of the palisade layer and the spongy parenchyma. Most mesophyll cells contain chloroplasts.

Test: Life Process and Nutrition - Question 4

Xerophytes have :

Detailed Solution for Test: Life Process and Nutrition - Question 4

A sunken stomata is a stomata in a small pit, which protects the escaping water vapor from air currents, decreasing water loss from the leaf. Sunken stomata are commonly found in plants in arid environments as one of their adaptations to preserve water. Plants with sunken stomata often have fewer stomata in general than plants.
Sunken stomata are a feature of many plants in deserts and other dry environments. This plants are generally reffered to as xerophytes. 

Test: Life Process and Nutrition - Question 5

Stomata controls :

Detailed Solution for Test: Life Process and Nutrition - Question 5

Stomata allow a plant to take in carbon dioxide, which is needed for photosynthesis. They also help to reduce water loss by closing when conditions are hot or dry. Stomata look like tiny mouths which open and close as they assist in transpiration.

Test: Life Process and Nutrition - Question 6

Each guard cells contain :

Test: Life Process and Nutrition - Question 7

Grana are present inside :

Test: Life Process and Nutrition - Question 8

In dark, the guard cells are :

Detailed Solution for Test: Life Process and Nutrition - Question 8

The stomata control gas exchange in the leaf. Each stomata can be open or closed, depending on how turgid it's guard cells are. In the light, the guard cells absorb water by osmosis, become turgid and the stomata opens. In the dark, the guard cells lose water, become flaccid and the stomata closes.

Test: Life Process and Nutrition - Question 9

In dicot plants, stomata are found in :

Detailed Solution for Test: Life Process and Nutrition - Question 9

Usually the lower surface of a dicot leaf has a greater number of stomata while in a monocot leaf they are more or less equal on both surfaces. In most of the floating plants, stomata are found only on the upper epidermis.

Test: Life Process and Nutrition - Question 10

The shape of stomata in monocot plant is :

Detailed Solution for Test: Life Process and Nutrition - Question 10

Stomata of monocot and dicot plants are kind of pores that occur in leaves and stem, facilitating the gas exchange. Transpiration also occurs through stomata. Monocots contain dumbbell-shaped guard cells, surrounding their stomata.

Test: Life Process and Nutrition - Question 11

In aquatic plant – Hydrilla stomata are :

Detailed Solution for Test: Life Process and Nutrition - Question 11

In Hydrilla, the function of stomata is the same as in the case of terrestrial plants i.e. transpiration and exchange of gases like CO2 or O2 but the only thing is that stomata are present more on the upper surface of the floating leaves of the plants as compared to the lower side of the leaves is submerged in water.

Test: Life Process and Nutrition - Question 12

The following light which is more effective in opening of stomata :

Detailed Solution for Test: Life Process and Nutrition - Question 12

Correct Answer :- d

Explanation : Stomatal responses to blue and red light were compared in leaves of Xanthium pennsylvanicum (which contain starch in their guard cells) and in onion leaves (which are devoid of starch). Blue light was found to be more effective than red in opening stomata in both species.

Test: Life Process and Nutrition - Question 13

In light phase of photosynthesis there is formation of –

Detailed Solution for Test: Life Process and Nutrition - Question 13

The correct answer is B as photophosphorylation is the production of ATP from ADP and H
3PO4 in presence of ligh1950609t and chlorophyll-a during the photochemical phase of photosynthesis. 
During cyclic photophosphorylation, ATP is produced and in non-cyclic photophosphorylation, ATP and NADPH2 are produced.

Test: Life Process and Nutrition - Question 14

Photosynthesis proceeds in sequence of –

Detailed Solution for Test: Life Process and Nutrition - Question 14

The correct answer is C as Photosynthesis proceeds in sequence of light phase and dark phase.

Test: Life Process and Nutrition - Question 15

The energy change in photosynthesis is form –

Detailed Solution for Test: Life Process and Nutrition - Question 15

Light energy is converted to chemical energy when a Photochemically excited special chlorophyll molecule of thr photosynthetic reaction center loses an electron, undergoing an oxidation reaction.

Test: Life Process and Nutrition - Question 16

Photosynthetic pigments are located in the chloroplast in –

Detailed Solution for Test: Life Process and Nutrition - Question 16

Photosynthetic pigments are located in the Grana. The green pigment chlorophyll is located within the thylakoid membrane, and the space between the thylakoid and the chloroplast membranes is called the stroma.

Test: Life Process and Nutrition - Question 17

The oxygen in photosynthesis is released from –

Test: Life Process and Nutrition - Question 18

The process in which water is split during photosynthesis is –

Detailed Solution for Test: Life Process and Nutrition - Question 18

The correct option is A.
In a process called photolysis ('light' and 'split'), light energy and catalysts interact to drive the splitting of water molecules into protons (H+), electrons, and oxygen gas.

Test: Life Process and Nutrition - Question 19

Dark reaction of photosynthesis occurs in –

Detailed Solution for Test: Life Process and Nutrition - Question 19

The dark reaction occurs in the stroma of the chloroplast, where they utilize the products of the light reaction. 

Test: Life Process and Nutrition - Question 20

In bacterial photosynthesis, the hydrogen donor is –

Detailed Solution for Test: Life Process and Nutrition - Question 20

The correct answer is B  as Bacterial photosynthesis is mostly similar to the normal plant synthesis.
Similarly, the bacterial photosynthesis also uses the hydrogen molecules for the photosynthesis reactions,just like the normal plant photosynthesis.
And the donor of hydrogen in the bacterial photosynthesis is the hydrogen sulphide.
 

Test: Life Process and Nutrition - Question 21

Human beings are –

Test: Life Process and Nutrition - Question 22

Gastric juice is –

Test: Life Process and Nutrition - Question 23

Which one does not produce any digestive enzyme?

Detailed Solution for Test: Life Process and Nutrition - Question 23

The liver doesn't secrete any enzymes. The liver secretes bile. In the presence of bile, lipase, an enzyme breaks down the fat into smaller units. Bile is stored on the gall bladder. 

Test: Life Process and Nutrition - Question 24

The number of salivary glands present in human beings is –

Detailed Solution for Test: Life Process and Nutrition - Question 24

There are three pairs of major Salivary glands :- the parotid glands, the submandibular glands and the sublingual glands.

Test: Life Process and Nutrition - Question 25

Largest gland in the body is –

Detailed Solution for Test: Life Process and Nutrition - Question 25

Liver is the largest gland in human body. It carries out many functions such as secretion of bile juices for decomposition of lipids and vitamins, preparation of proteins for blood plasma that enables blood clotting and also detoxification.

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